"The linguistic attributes are mapped onto archaeological correlates: artifacts are selected, like the chariot, as well as ecofacts, like agriculture, or whole archaeological cultures (material assemblages). The archaeological correlates become some sort of labels or tags that one may employ in order to trace the supposed Indo-European populations. But, in fact, very little of the illustrative archaeological material actually exhibits specific Indo-European or Indo-Iranian traits; a question therefore arises: what is the relevance of archaeological material if any sort of assemblage present at the expected or supposed time/space spot can function as the tag of a linguistic group?"
January 1, 1970
https://en.wikiquote.org/wiki/Migrationism_and_diffusionism